Your offense looks solid and your SP has potential. Miller and Penny are big injury risk and Garcia and Vazquez haven't been all that steady. That said if three of those guys can put together good seasons and you can find another couple of servicable starters later, I think you've got a decent shot.
It actually reminds me of my 12 teams HTH team last year. All hitting, with Burnett, Vaz and Zito as my top three starters. I compiled the most points in the league, but inconsistnet pitching and some bad luck left me with just a .500 record.